No. 532] GENETIC AL STUDIES ON (EN OTHER A 217 



not be inferred that the characters of the hybrids are a 

 perfect mean as to the measurement and proportions of 

 their organs. This is certainly not the case for all of 

 the characters of the hybrids and it would be a difficult 

 matter to determine a perfect blend for a single character 

 because of the fluctuating variations in the parent strains. 

 All that I desire to demonstrate in the present account 

 is the fact of blended conditions throughout these hybrids 

 of the first generation, and the total absence of clear domi- 

 nance of one parent over the other with respect to any 

 character. 



It would be very difficult and probably impossible to 

 support satisfactorily a claim that either of the two par- 

 ent plants exhibited its influence to a measurably greater 

 degree than the other. To illustrate this point let us 

 examine hybrid 10.30 La. The rosette ( Fig. 9) of this 

 plant might be said to be more like that of biennis than of 

 grandiftora, but the habit of the mature plant (Fig. 10) 

 with respect to its short clustered shoots is more like the 

 latter parent than the former, and thus two characteristic 

 stages of the plant suggest opposite conclusions. This 

 general balance of the influence of one parent over the 

 other was manifest throughout the greater part of the 

 culture, but, as previously noted, a small proportion of the 

 hybrids was readily distinguishable as being more like 

 biennis or grandiftora although never approaching closely 

 to either parent form. 



The chief points of resemblance between the two hy- 

 brid plants just described and (Enothera Lamarckiana 

 may be briefly summarized as follows : 



1. The inflorescence was very similar to Lamarckiana, 

 especially in the case of hybrid 10.30 La from which many 

 branches might have been picked that as herbarium spe- 

 cimens could not have been separated from a mixed and 

 varied collection of Lamarckiana branches similarly pre- 

 pared. 



2. The only essential difference between the buds lay 



